Abstract
Identifying the mechanisms regulating starch remobilization after heading in rice leaf sheaths is essential to understand the capability of the source for grain filling. In the present study, the changes in starch content and expression levels of α-amylase genes in the third leaf sheaths of Takanari, a high-yielding indica cultivar, were compared with those of Nipponbare, a standard japonica cultivar, during the post-heading stage to examine the starch remobilization characteristics in the leaf sheath of a high-yielding cultivar. Starch content in Takanari tended to decrease at a faster rate than in Nipponbare starting 3 days after heading. The decrease in starch content during 12 days after heading was greater in Takanari than in Nipponbare. Of eight genes predicted to encode α-amylase in the rice genome, RAmy2A and RAmy3C were primarily expressed in the leaf sheaths after heading. Moreover, RAmy2A mRNA level peaked at 9 days after heading in both cultivars. Particularly in Takanari, the RAmy2A mRNA levels rapidly increased from 3 to 9 days after heading. In addition, α-amylase activity was significantly higher in Takanari than in Nipponbare at 9 days after heading. Our results suggest that the rapid degradation of starch in the leaf sheaths of Takanari at the post-heading stage may be attributed, at least in part, to the enhancement of α-amylase activity caused by an increase in RAmy2A transcription level.
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Claims 7
Claim · model-written summary
Starch content in Takanari leaf sheaths tended to decrease at a faster rate than in Nipponbare starting 3 days after heading.
- Taxon
- Rice
Oryza sativat0 - Material
- Takanarie0
- Outcome
- Starch contente0
- Direction
- decreasee0
- Comparator
- Nipponbaree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Starch content in Takanari tended to decrease at a faster rate than in Nipponbare starting 3 days after heading”
t0“Rice Leaf Sheaths”
Claim · model-written summary
The decrease in starch content during 12 days after heading was greater in Takanari than in Nipponbare.
- Taxon
- RiceOryza sativat0
- Material
- Takanarie0
- Outcome
- decrease in starch contente0
- Direction
- greatere0
- Comparator
- Nipponbaree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The decrease in starch content during 12 days after heading was greater in Takanari than in Nipponbare”
t0“Rice Leaf Sheaths”
Claim · model-written summary
Of eight predicted alpha-amylase genes, RAmy2A and RAmy3C were primarily expressed in the leaf sheaths after heading.
- Taxon
- RiceOryza sativat0
- Gene
- RAmy2A and RAmy3Ce0
- Outcome
- primarily expressed in the leaf sheaths after headinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RAmy2A and RAmy3C were primarily expressed in the leaf sheaths after heading”
t0“Rice Leaf Sheaths”
Claim · model-written summary
RAmy2A mRNA level peaked at 9 days after heading in both Takanari and Nipponbare.
- Taxon
- RiceOryza sativat0
- Gene
- RAmy2Ae0
- Outcome
- RAmy2A mRNA levele0
- Direction
- peakede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“RAmy2A mRNA level peaked at 9 days after heading in both cultivars”
t0“Rice Leaf Sheaths”
Claim · model-written summary
In Takanari, RAmy2A mRNA levels rapidly increased from 3 to 9 days after heading.
- Taxon
- RiceOryza sativat0
- Material
- Takanarie0
- Gene
- RAmy2Ae0
- Outcome
- RAmy2A mRNA levelse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Particularly in Takanari, the RAmy2A mRNA levels rapidly increased from 3 to 9 days after heading”
t0“Rice Leaf Sheaths”
Claim · model-written summary
alpha-Amylase activity was significantly higher in Takanari than in Nipponbare at 9 days after heading.
- Taxon
- RiceOryza sativat0
- Material
- Takanarie0
- Outcome
- α-amylase activitye0
- Direction
- highere0
- Comparator
- Nipponbaree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“α-amylase activity was significantly higher in Takanari than in Nipponbare at 9 days after heading”
t0“Rice Leaf Sheaths”
Claim · model-written summary
The authors suggest rapid starch degradation in Takanari leaf sheaths after heading may be attributed at least partly to enhanced alpha-amylase activity caused by increased RAmy2A transcription.
- Taxon
- RiceOryza sativat0
- Material
- Takanarie0
- Gene
- RAmy2Ae0
- Outcome
- rapid degradation of starche0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the rapid degradation of starch in the leaf sheaths of Takanari at the post-heading stage may be attributed, at least in part, to the enhancement of α-amylase activity caused by an increase in RAmy2A transcription level”
t0“Rice Leaf Sheaths”